Bicycle frame



FIG. 1 is a front and right-side perspective showing a bicycle frame that embodies the design;

FIG. 2 is a rear and right-side perspective view thereof;

FIG. 3 is a right-side elevation view thereof, wherein the left-side elevation view is a mirror image thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

Where utilized, the broken lines show portions of the bicycle frame that form no part of the claimed design. 

CLAIM The ornamental designs for a bicycle frame, as shown and described. 